Floating wind turbine response in uni- and multi-directional nonlinear waves by numerical and experimental investigations

Author:

Ning Dezhi12ORCID,Deng Sijia12,Liu Yingyi3ORCID,Zhou Yu12ORCID,Chen Lifen12

Affiliation:

1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology 1 , Dalian 116024, China

2. Dalian Key Laboratory of Offshore Renewable Energy, Dalian University of Technology 2 , Dalian 116024, China

3. Research Institute for Applied Mechanics, Kyushu University 3 , Fukuoka 8168580, Japan

Abstract

Natural sea waves are typically multi-directional. However, the existing studies on the interaction of waves and structures mostly concentrate on uni-directional waves. In this study, using a higher-order boundary element method based on the nonlinear potential flow theory and the perturbation expansion technique, a numerical model is developed to investigate the hydrodynamic performance of a semi-submersible wind turbine foundation in uni- and multi-directional waves. Comprehensive validations with the wave-tank experiment are conducted. It is found that the significant platform response increases with the peak wave period in uni-directional irregular waves, while the high-frequency “energy” ratio changes little. The significant wave height hardly influences motion responses from either the time- or the frequency-domain perspective. In multi-directional irregular waves, the translational motions exhibit monotonicity with wave directionality. The energy concentration around the primary direction leads to a dominant wave-frequency motion and an increase in the high-frequency “energy” ratio. Although the individual modal motion responses are variable functions of wave nonlinearity, their averaged translational and rotational motions are nearly constant, indicating an energy transition or a trade-off relationship among the modal motions. In addition, unlike the uni-directional wave case, the low- and high-frequency “energy” ratios increase quadratically and decrease linearly with the significant wave height in multi-directional waves, respectively. All these findings demonstrate that wave directionality can change the wave–structure interaction properties and therefore needs to be adequately considered in engineering applications.

Funder

Open Funding of State Key Laboratory of Coastal and Offshore Engineering

National Natural Science Foundation of China

Liaoning Revitalization Talents Program

Publisher

AIP Publishing

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